EPA is approving State Implementation Plan (SIP) revisions submitted by the Governor of Montana on June 26, 1997, and June 13, 2000, as meeting the requirements for moderate PM-10 nonattainment areas contained in Part D of the Clean Air Act. (Portions of the June 26, 1997, submittal were withdrawn by the Governor of Montana on February 28, 1999. We are only acting on the portions of the June 26, 1997, submittal that were not withdrawn.) These revisions contain an inventory of emissions for Thompson Falls and establish and require continuation of all control measures adopted and implemented for reductions of particulate matter with an aerodynamic diameter less than or equal to 10 micrometers (PM<INF>10</INF>) in order to attain the PM<INF>10</INF> National Ambient Air Quality Standards (NAAQS) in Thompson Falls. We are approving the control measures and the emissions inventory as part of the Montana SIP and making the control measures Federally enforceable. Also, we will be taking action on other portions of the June 13, 2000, submittal at a later time. This action is being taken under section 110 of the Clean Air Act.